The River Mert (); anciently, the Lycastus () is a river in Turkey which flows into the Black Sea at Samsun.
Geography In 2022 flow measurements were lacking.
History The ancient town of Lycastus in Pontus was located on the river; the site has not been located.
Pollution A local politician claims the river suffers from domestic and industrial pollution, and fish die off in 2014 is being investigated by local officials.
Flooding In 2012 flooding killed 5 people.
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